Bicycle frame



FIG. 1 is a perspective view of a first embodiment for a bicycle frameshowing our new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a left side elevational view thereof;

FIG. 5 is a right side elevational view thereof;

FIG. 6 is a top plan view thereof;

FIG. 7 is a bottom plan view thereof;

FIG. 8 is a front perspective view thereof;

FIG. 9 is a perspective view of a second embodiment for a bicycle frameshowing our new design;

FIG. 10 is a front elevational view thereof;

FIG. 11 is a rear elevational view thereof;

FIG. 12 is a left side elevational view thereof;

FIG. 13 is a right side elevational view thereof;

FIG. 14 is a top plan view thereof;

FIG. 15 is a bottom plan view thereof; and,

FIG. 16 is a front perspective view thereof.

The broken lines and the grayed-out regions represent features whichform no part of the claimed design.

CLAIM The ornamental design for a bicycle frame, as shown and described.